Questions tagged [electron]
Anything related to the behavior and properties of electrons, i.e. the elementary subatomic particles accounting for electrical conduction in most solid materials, especially metals.
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0answers
48 views
Magnetic lens supplier [closed]
What companies sell magnetic lenses?
Google searching yielded no results for magnetic lens suppliers.
My application is pricing out a TEM.
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7answers
149 views
How many Electrons make a bit? [closed]
A bit, correct me if i'm wrong, is a digital signal which can be 0 or 1. To determine its value, a processor awaits an X amount of time. My question is: is there any way to determine how many ...
0
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0answers
22 views
How does the hot point-probe test affect p-type semiconductors?
In an n-type semiconductor if you place a hot probe close to a cold metal probe, the average thermal velocity of electrons near the hot probe increases which leads to a net electron motion from the ...
0
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3answers
49 views
Ground attached to negative terminal - where do the electrons come from?
My question pertains to this circuit:
Not considering conventional current direction, but rather considering actual electron flow: if the negative terminal is connected to the ground, where do the ...
1
vote
1answer
29 views
Thermal generation of electron-hole couples and reverse biasing
I'm studying the PN junction and I have some problems figuring out thermal generation of couples electron-hole in reverse biasing.
The analysis is the standard one (for example, one can find it in the ...
0
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2answers
90 views
What happens when switch is open [duplicate]
In a simple circuit, composed only of a lamp, a generator and a switch that connects the generator to the lamp.
What happens with electric current when the switch is open? Electrons turn around? They ...
0
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3answers
157 views
How can an electron have 0 electric potential after exiting a resistor but have current?
Unfortunately, I am not able to respond and ask a question on this specific post so I am going to ask a question based on the answers of the user "Transistor" in this post because I am still confused.
...
6
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3answers
744 views
How do electrons carry thermal energy in Peltier coolers?
I've read that when electrons enter from metal to semiconductor type N, they gain thermal energy and make that side cooler and the reverse happens when they leave semiconductor to the conductor.
Why ...
0
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2answers
73 views
current speed/flow [closed]
Note
my questions are in form of explaining. its because I've scattered information (or assumptions) and it want to link them. that's probably why you can see me explaining to much?
Question part:
...
3
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2answers
417 views
A question about electrons, charges and current
Let's talk about DC, a very simple circuit: a light bulb and a battery.
Some authors say that electrons move from negative to positive and current from positive from negative.
I always thought ...
3
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0answers
287 views
How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other? [duplicate]
An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following:
While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
0
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2answers
83 views
How do electrons flow?
I have been told that the movement of electrons is like a chain on a bicycle, however on videos for batteries i see that there is a charge seperation and when a wire is connected, these electrons flow ...
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2answers
95 views
Will electrons be taken from a metal plate if a positive charge is applied to it?
If I have a single metal plate, a battery, and one wire. If I connect the wire to the positive on the battery to the metal plate, does that remove electrons from the metal plate?
I am attempting to ...
2
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3answers
129 views
Why the earth attracts charge and where does the charge go when it goes into ground?
Self-explanatory question but to add what I know, by this I will also know if I am right or wrong.
I read somewhere that Earth is positively charged, but is not the state (whether positive/negative) ...
0
votes
2answers
56 views
Effect of electron discrete nature on current density
Coulomb’s law states that the current that flows through a wire is proportional to the applied voltage. For sure there are many physical effects (linear and non-linear) that participates in the ...
0
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1answer
96 views
Relation between Amps and Thickness of wires
I have some questions that have been bugging me for the past few days, and I am here in hope of some help.
My Understanding of how battery works: "The battery (say 9V DC) does not store charge, it ...
0
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3answers
327 views
Why does current have to return to its source in a circuit?
As far as I know there should be a current when a high potential point is connected to a low potential point, but apparently that is not true. I understand that a circuit must be closed in order for ...
5
votes
3answers
192 views
How does current turn to heat/light? [duplicate]
When resistors are serially connected, the current is the same through the whole circuit. To my knowledge, the electric current is electrons traveling.
Also, the power of the generator equals the ...
3
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3answers
2k views
So which direction do electrons really flow?
As I understand it, electrons (which are negatively charged) flow towards positive.
As a convention, we say that current flows from positive to negative. Is this to say that what you connect the ...
2
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2answers
197 views
Why do electrons move as if on conveyor belt in a circuit?
For example sometimes people will ask whether it matters what side of a component you place a resistor on. Surprisingly, it doesn't matter because electrons behave as if they're all connected together ...
0
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1answer
113 views
Electrons and Holes in a semiconductor
In an exercise I have an un-doped silicon I find that p=1.80e+11 ,n=6.60e+10 , should the numbers be more close to each other? (for example in GaAs I find 1.10e+14 and 1.60e+14)?? (also p number of ...
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2answers
161 views
Why is conventional current still taught in school when it is unreal, given that real current flow is electron flow? [duplicate]
Conventional current as a concept is easily understood until the professor says what actually takes place is electron flow. Electron flow moves in the opposite direction as conventional current.
Why ...
0
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1answer
87 views
Why don't electrons in Parralel battery circuits repel?
Here is a short Anecdote, which will give a good explanation into my question. I was in a Science class, and we were doing a circuit with a very small Filament Light Bulb, and some AAA Batteries. I ...
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2answers
145 views
Conductor interaction with single battery terminal
What really is happening inside a wire and inside battery when I connect one end of wire to the one terminal of battery but not the other (open circuit )?
Questions:
If I connect to the '+' ...
0
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0answers
93 views
Theory : High voltage but low current
I read that :
A generator products electrons that it sends into wire
The electron motion is due to the repulsive behavior between electrons
So to increase the voltage (speed of electrons?), ...
2
votes
2answers
401 views
Number of electron with a current of 1A
i'm reading a book that it says :
If a current of 1A flows through a copper wire, the number of electrons flowing by a cross section of the wire in 1s is equal to :
1A=(1C/1s)(electron/-1.602*...
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2answers
152 views
Where do electrons go after reaching GND in this Arduino Mega design?
When examining the EAGLE file for the Arduino Mega that I downloaded from their official website, I noticed that the ground (GND) is not connected to anything other than the C4 component, which means ...
0
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1answer
111 views
Why does high voltage imply a high “pushing force” on electrons?
Another word for potential difference, is apparently, "voltage drop", although I've heard potential difference be interchangeable with just voltage, as well, a bit confusingly. However, if I ...
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vote
1answer
213 views
conventional current flow and ground plane
I'm a student.
I cant understand why we design ground planes to have a easy (low resistance) path for return current.....
If the real flow of electrons is from battery (-) to battery (+) we should ...
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6answers
4k views
Why do electrons flow from a lower potential energy to a higher potential energy?
So I understand that the term "voltage" refers to the potential energy difference between two points. So, in a 5v battery, there is a 5v difference between the positive and negative ends. When these ...
0
votes
1answer
134 views
How to spot different electronic devices? [closed]
Recently my university has changed traditional counter meters into intelligent ones where they cut the power for illegal devices. At first as the rules say, the illegal ones are those with power usage ...
0
votes
1answer
2k views
Wiring an On-Off-On-Off pushbutton
I am new to electricity & electronics, and I'm interested in using this "On-Off-On-Off" pushbutton in a project. I want to just make sure that I understand how its intended to be wired:
In that ...
0
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2answers
60 views
What is the energy in “electron-volts” of an electron that has risen though a potential of 3V?
I came across this question when reading about semiconductors, and found out I didn't really get the concept of electron volt with respect to voltage and electric field applied to an electron.
So the ...
0
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1answer
216 views
Why is the positive side said to have a higher voltage than the negative side? [closed]
My question is, are textbooks just saying the positive side of a battery has a higher voltage because mathematically + is higher than - even when, in reality, there is nothing to come out of the ...
0
votes
2answers
59 views
Is there any different on the same amount of amps with different voltages?
Have two different loads on two circuits, the first circuit is running at 3.3V, second is 5V. Those two loads draw exactly 100mA on each. The question is, does those two circuits have the same amount ...
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vote
3answers
253 views
Electromagnetic waves [closed]
I have a problem to understand how electromagnetic waves works. Why do transistors create EM waves when they're switching? And difference between antenna and transformer with secondary coil. When I ...
0
votes
2answers
85 views
Why would electrons cross a cross section when there is no potential difference?
There is a cross section , it's said that electrons move from left to right and vice versa, and the total sum of the electrons crossing this section from left to right is equal to the ones crossing ...
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1answer
92 views
Confused about current flow
I am starting to learn about electronics and I am still confused about current flow. Initially the book would try to be clear about the distinction between conventional and actual flow but then ...
2
votes
0answers
351 views
Semiconductor physics, effective mass calculations, band edge. vs. DOS vs cyclotron resonance
I am trying to understand effective mass for electron carriers in the conduction band as found in experiments. I am using the equations in a simulator. The simulator models power mosfets from -85C to ...
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2answers
854 views
electron flow discharging/charging battery [closed]
I understand that the electron flow is from the anode to cathode when discharging a battery but I don't understand why it is reversed for when charging a battery?
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4answers
988 views
Why can you not create an Infinite Battery? [closed]
As far I know the power electricity is flow of electrons from anode to cathode of the battery. So basically the electrons flow through the circuit and return to cathode. Why can't we reuse these ...
0
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1answer
73 views
NOOB Question: Is there away to keep electrons constantly flowing?
What i mean by this is we run things on lets say a battery, but eventually it runs out. Is there away we can have electrons stay trapped in a constant flow so the electrons keep getting recycled?
0
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0answers
39 views
Another way to increase Tungsten filament resistance? [duplicate]
I understand that the thing that allow a lightbulb to glow white high is the fast amount of resistance the electrons face with all the many spiral the filament has. But I need a thicker more resistant ...
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votes
6answers
2k views
How to function a TV electron gun for experiments [closed]
right to the point, I'm study physics and I want to do some experiments like q/m, oscilloscope, etc and I needed an electron gun. I had an old crt TV and I took out it's electron gun and vacuum tube ...
8
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4answers
1k views
Free Electron in Current
An electric current is a flow of free electrons. Are these free electrons totally free from the orbits of metal atom or they moving by jumping from one orbit to another orbit of the atoms?
If they ...
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votes
3answers
624 views
Are diodes backwards?
So I've been learning about diodes (since I don't have an electrical background).
Technically, current flows from the negative side to the positive side (electron current flow).
However, a diode ...
0
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2answers
482 views
Run out of electrons
If electricity is a flow of electrons in a wire then eventually all electrons will leave the beginning of the wire and reach the end of the wire. Is that possible? Why if not? What will happen then if ...
0
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5answers
200 views
What does 'Voltage is the energy per particle' expressions mean?
I recently heard the expression that "Voltage is the amount of energy per electrical particle". I am confused about what it means. Isn't every particle have a certain amount of electrical energy?
How ...
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1answer
107 views
When do the holes in semiconductor appear?
I'm trying to understand the concept of semiconductors, as far as I know whenever an electron moves it leaves a hole, so how can we say (for example) that n-type semiconductor has a majority of \$e^-\$...
2
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1answer
107 views
Why is there no shot noise in conducting wires?
Why is there no shot noise in conducting wires, while it is present in junctions and barriers like PN junction? Is electron flow not quantized in wires? If it is, why do a resistor and perfectly ...
